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| Mirrors > Home > MPE Home > Th. List > funcnv0 | Structured version Visualization version GIF version | ||
| Description: The converse of the empty set is a function. (Contributed by AV, 7-Jan-2021.) |
| Ref | Expression |
|---|---|
| funcnv0 | ⊢ Fun ◡∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fun0 6602 | . 2 ⊢ Fun ∅ | |
| 2 | cnv0 5867 | . . 3 ⊢ ◡∅ = ∅ | |
| 3 | 2 | funeqi 6558 | . 2 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 4 | 1, 3 | mpbir 234 | 1 ⊢ Fun ◡∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∅c0 4282 ◡ccnv 5658 Fun wfun 6531 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pr 5402 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-mo 2566 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-br 5108 df-opab 5172 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-fun 6539 |
| This theorem is used by: f10 6855 pthdlem1 30239 0trl 30600 0pth 30603 |
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